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http://dx.doi.org/10.7845/kjm.2015.5008

Characterization and phylogenetic analysis of halophilic bacteria isolated from rhizosphere soils of coastal plants in Dokdo islands  

You, Young-Hyun (School of Life Science, Kyungpook National University)
Park, Jong Myong (LOTTE R&D Center)
Lee, Myung-Chul (National Agrobiodiversity Center, NAAS, RDA)
Kim, Jong-Guk (School of Life Science, Kyungpook National University)
Publication Information
Korean Journal of Microbiology / v.51, no.1, 2015 , pp. 86-95 More about this Journal
Abstract
To study the halobacterial diversity at the rhizospheric soil of coastal plant native to Dokdo islands, several host plant were selected and its rhizospheric soil was sampled. Soil sample was diluted serially and pure isolation was done by sub-culture using marine agar media. 26 halophilic strains cultivable at the marine medium containig concentration of 9.0% sodium chloride were selected among total 161 isolates. Their partial 16S rRNA gene sequences extracted from genomic DNA were analyzed and partially identified. Furthermore, to identify their genetic relationship, phylogenetic tree was deduced. Total 26 strains were belongs to Firmicutes (30.8%), Gamma proteobacteria (53.8%), Bacteroidetes (7.7%), Alpha proteobacteria (7.7%), and Actinobacteria (7.7%). These results showed the specific difference from previous researches which has been reported the microbial flora of soil or sea water around the Dokdo islands. Furthermore, 4 among 26 halophilic strains grew at above 12.0% NaCl concentrated marine broth, and 2 strains Idiomarina abyssalis LM4H23 and Halomonas huangheensis AS4H13 grew at 15.0% concentration. These halophilic strains thought to overcoming the severe stress like high salt concentration or variation derived from Dokdo-specific climate and might have unknown, specific relationship with their host coastal plant native to Dokdo islands.
Keywords
coastal plant; Dokdo islands; halophilic bacteria; phylogenetic analysis;
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